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Polytropic pressure analysis of HCCI combustion initiated by pulsed flame jet

Murase E., Moriue O., Hotta K., Nakashima F.

Archivum Combustionis

2011

Vol. 31 nr 3

167-175

Homogeneous Charge Compression Ignition (HCCI) engines are the most promising future engines. However, it is quite difficult to control the ignition timing because the onset of the HCCI combustion depends on the autoignition of the fuel. On the other hand, Pulsed Flame Jet (PFJ) ignition has a great potential to enhance ignition reliability and burning rate of lean fuel/air mixtures, as it issues a turbulent jet plume of incomplete combustion products from the igniter and the volumetric combustion is initiated. Therefore, we considered the use of PFJ for the trigger of autoignition of HCCI combustion, and then we have demonstrated that PFJ has a potential for controlling the start of HCCI combustion directly. In this paper, the polytropic pressure analysis was done and it was revealed that the HCCI combustion with ignition timing control by PFJ showed higher effective use of heat released by the reactions of fuel than that without ignition timing control by PFJ.